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280 lines (265 loc) · 11.1 KB
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package com.jsoniter;
import com.jsoniter.spi.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.*;
class Codegen {
// only read/write when generating code with synchronized protection
private final static Set<String> generatedClassNames = new HashSet<String>();
static CodegenAccess.StaticCodegenTarget isDoingStaticCodegen = null;
static Decoder getDecoder(String cacheKey, Type type) {
Decoder decoder = JsoniterSpi.getDecoder(cacheKey);
if (decoder != null) {
return decoder;
}
return gen(cacheKey, type);
}
private synchronized static Decoder gen(String cacheKey, Type type) {
Decoder decoder = JsoniterSpi.getDecoder(cacheKey);
if (decoder != null) {
return decoder;
}
List<Extension> extensions = JsoniterSpi.getExtensions();
for (Extension extension : extensions) {
type = extension.chooseImplementation(type);
}
type = chooseImpl(type);
for (Extension extension : extensions) {
decoder = extension.createDecoder(cacheKey, type);
if (decoder != null) {
JsoniterSpi.addNewDecoder(cacheKey, decoder);
return decoder;
}
}
ClassInfo classInfo = new ClassInfo(type);
decoder = CodegenImplNative.NATIVE_DECODERS.get(classInfo.clazz);
if (decoder != null) {
return decoder;
}
addPlaceholderDecoderToSupportRecursiveStructure(cacheKey);
try {
Config currentConfig = JsoniterSpi.getCurrentConfig();
DecodingMode mode = currentConfig.decodingMode();
if (mode == DecodingMode.REFLECTION_MODE) {
decoder = ReflectionDecoderFactory.create(classInfo);
return decoder;
}
if (isDoingStaticCodegen == null) {
try {
decoder = (Decoder) Class.forName(cacheKey).newInstance();
return decoder;
} catch (Exception e) {
if (mode == DecodingMode.STATIC_MODE) {
throw new JsonException("static gen should provide the decoder we need, but failed to create the decoder", e);
}
}
}
String source = genSource(mode, classInfo);
source = "public static java.lang.Object decode_(com.jsoniter.JsonIterator iter) throws java.io.IOException { "
+ source + "}";
if ("true".equals(System.getenv("JSONITER_DEBUG"))) {
System.out.println(">>> " + cacheKey);
System.out.println(source);
}
try {
generatedClassNames.add(cacheKey);
if (isDoingStaticCodegen == null) {
decoder = DynamicCodegen.gen(cacheKey, source);
} else {
staticGen(cacheKey, source);
}
return decoder;
} catch (Exception e) {
String msg = "failed to generate decoder for: " + classInfo + " with " + Arrays.toString(classInfo.typeArgs) + ", exception: " + e;
msg = msg + "\n" + source;
throw new JsonException(msg, e);
}
} finally {
JsoniterSpi.addNewDecoder(cacheKey, decoder);
}
}
private static void addPlaceholderDecoderToSupportRecursiveStructure(final String cacheKey) {
JsoniterSpi.addNewDecoder(cacheKey, new Decoder() {
@Override
public Object decode(JsonIterator iter) throws IOException {
Decoder decoder = JsoniterSpi.getDecoder(cacheKey);
if (this == decoder) {
for(int i = 0; (i < 30) && (this == decoder); i++) {
decoder = JsoniterSpi.getDecoder(cacheKey);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
throw new JsonException(e);
}
}
if (this == decoder) {
throw new JsonException("internal error: placeholder is not replaced with real decoder");
}
}
return decoder.decode(iter);
}
});
}
public static boolean canStaticAccess(String cacheKey) {
return generatedClassNames.contains(cacheKey);
}
private static Type chooseImpl(Type type) {
Type[] typeArgs = new Type[0];
Class clazz;
if (type instanceof ParameterizedType) {
ParameterizedType pType = (ParameterizedType) type;
clazz = (Class) pType.getRawType();
typeArgs = pType.getActualTypeArguments();
} else if (type instanceof WildcardType) {
return Object.class;
} else {
clazz = (Class) type;
}
Class implClazz = JsoniterSpi.getTypeImplementation(clazz);
if (Collection.class.isAssignableFrom(clazz)) {
Type compType = Object.class;
if (typeArgs.length == 0) {
// default to List<Object>
} else if (typeArgs.length == 1) {
compType = typeArgs[0];
} else {
throw new IllegalArgumentException(
"can not bind to generic collection without argument types, " +
"try syntax like TypeLiteral<List<Integer>>{}");
}
if (clazz == List.class) {
clazz = implClazz == null ? ArrayList.class : implClazz;
} else if (clazz == Set.class) {
clazz = implClazz == null ? HashSet.class : implClazz;
}
return GenericsHelper.createParameterizedType(new Type[]{compType}, null, clazz);
}
if (Map.class.isAssignableFrom(clazz)) {
Type keyType = String.class;
Type valueType = Object.class;
if (typeArgs.length == 0) {
// default to Map<String, Object>
} else if (typeArgs.length == 2) {
keyType = typeArgs[0];
valueType = typeArgs[1];
} else {
throw new IllegalArgumentException(
"can not bind to generic collection without argument types, " +
"try syntax like TypeLiteral<Map<String, String>>{}");
}
if (clazz == Map.class) {
clazz = implClazz == null ? HashMap.class : implClazz;
}
if (keyType == Object.class) {
keyType = String.class;
}
MapKeyDecoders.registerOrGetExisting(keyType);
return GenericsHelper.createParameterizedType(new Type[]{keyType, valueType}, null, clazz);
}
if (implClazz != null) {
if (typeArgs.length == 0) {
return implClazz;
} else {
return GenericsHelper.createParameterizedType(typeArgs, null, implClazz);
}
}
return type;
}
private static void staticGen(String cacheKey, String source) throws IOException {
createDir(cacheKey);
String fileName = cacheKey.replace('.', '/') + ".java";
FileOutputStream fileOutputStream = new FileOutputStream(new File(isDoingStaticCodegen.outputDir, fileName));
try {
OutputStreamWriter writer = new OutputStreamWriter(fileOutputStream);
try {
staticGen(cacheKey, writer, source);
} finally {
writer.close();
}
} finally {
fileOutputStream.close();
}
}
private static void staticGen(String cacheKey, OutputStreamWriter writer, String source) throws IOException {
String className = cacheKey.substring(cacheKey.lastIndexOf('.') + 1);
String packageName = cacheKey.substring(0, cacheKey.lastIndexOf('.'));
writer.write("package " + packageName + ";\n");
writer.write("public class " + className + " implements com.jsoniter.spi.Decoder {\n");
writer.write(source);
writer.write("public java.lang.Object decode(com.jsoniter.JsonIterator iter) throws java.io.IOException {\n");
writer.write("return decode_(iter);\n");
writer.write("}\n");
writer.write("}\n");
}
private static void createDir(String cacheKey) {
String[] parts = cacheKey.split("\\.");
File parent = new File(isDoingStaticCodegen.outputDir);
for (int i = 0; i < parts.length - 1; i++) {
String part = parts[i];
File current = new File(parent, part);
current.mkdir();
parent = current;
}
}
private static String genSource(DecodingMode mode, ClassInfo classInfo) {
if (classInfo.clazz.isArray()) {
return CodegenImplArray.genArray(classInfo);
}
if (Map.class.isAssignableFrom(classInfo.clazz)) {
return CodegenImplMap.genMap(classInfo);
}
if (Collection.class.isAssignableFrom(classInfo.clazz)) {
return CodegenImplArray.genCollection(classInfo);
}
if (classInfo.clazz.isEnum()) {
return CodegenImplEnum.genEnum(classInfo);
}
ClassDescriptor desc = ClassDescriptor.getDecodingClassDescriptor(classInfo, false);
if (shouldUseStrictMode(mode, desc)) {
return CodegenImplObjectStrict.genObjectUsingStrict(desc);
} else {
return CodegenImplObjectHash.genObjectUsingHash(desc);
}
}
private static boolean shouldUseStrictMode(DecodingMode mode, ClassDescriptor desc) {
if (mode == DecodingMode.DYNAMIC_MODE_AND_MATCH_FIELD_STRICTLY) {
return true;
}
List<Binding> allBindings = desc.allDecoderBindings();
for (Binding binding : allBindings) {
if (binding.asMissingWhenNotPresent || binding.asExtraWhenPresent || binding.shouldSkip) {
// only slice support mandatory tracking
return true;
}
}
if (desc.asExtraForUnknownProperties) {
// only slice support unknown field tracking
return true;
}
if (!desc.keyValueTypeWrappers.isEmpty()) {
return true;
}
boolean hasBinding = false;
for (Binding allBinding : allBindings) {
if (allBinding.fromNames.length > 0) {
hasBinding = true;
}
}
if (!hasBinding) {
// empty object can only be handled by strict mode
return true;
}
return false;
}
public static void staticGenDecoders(TypeLiteral[] typeLiterals, CodegenAccess.StaticCodegenTarget staticCodegenTarget) {
isDoingStaticCodegen = staticCodegenTarget;
for (TypeLiteral typeLiteral : typeLiterals) {
gen(typeLiteral.getDecoderCacheKey(), typeLiteral.getType());
}
}
}
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